Distillation of readily volatilizable metals



March 6, 1934. F. JOHANNSEN ,9

DISTILLATION OF READILY VOLATlLIZA BLE METALS Fild Feb. 2, 1955 2 Sheets-Sheet 1 MM WW,

March 6, 19534. F. JOHANNSEN DISTILLATI ON OF READILY VOLATILIZABLE METALS Filed Feb; 2', 1933 2 Sheets-Sheet 2 Fig. 16

Fig. 1a

.i oneobject PM Mme. Iss4.

um'ren STATE Mmgdebm, p vsigner-toiirmrried-llrllnl ilrusonwcrkAktien ggelllehafi, German! marina-nos or mm! separation possess so high a temperatureth condensation of the metal vapours on the relatively cold char'ze will beavoided.

as Further obiectsand advantages 0! the invention wfll become apparent irom-the-iollowins description oi certain forms of. apparatus accordinz to the invention referred to by way of example onlyandiilustrateddiagramm cally intheacmpan sdrawinsa e mgureiisalcngitudinalsectionthroushan ap aratus wherein a retort is arrange on the axis or! rotation otthe iurnace. Figure 1a is an fragmentary view oi the connection-between the retort and condenser oirigui'el.

rigurelb is adetailview or one oiapair-oi valves which may be used with helix v an enlar ed vertical sectional view dinai sectio thro sh a rotarymrnaoewithsix retortsbuiit'into it.

In the iollowins description a.zinc process isreierred toby way of example. 7

In both examples 0! shown, 1 is the rotary furnace and 2 the rotation of the iurna'ee el thereto. At '3 there is worm teed device ior byabeltdrive. The charsetoberedue' and thereducingmedhm passiromthis'throushasiotinthewormhousint so totheworms. 'Ih'e b\mker4is tationar!,whilst t insthereisapacking the residue dis-.

- means of a burner zinc retort or rctou'ts,v

areiedintoabunkeri-and rm 2. macaw No. 154.965 In Germany February 12, ms

(man-es) the housins o! the worm the furnac between the bunker and the housmedium. 5 shows the cone denser serving for the precipitation of the zinc vapours. Ate the vapourspasinto the condenser; 00 whilst the exhaust gases oi condensation pass outat 'I,ihatistosay,inthe directional theaxis of rotation, avphras which, where it appears in the claims of this specification to be regarded.

' either actually along the axis or parallel thereto. As, in order to prevent the formaa lect the condenser exhaust gases. structional'iorm accordi s to haust gases irom the 7 space 9 and are guided back surrounding to the chamber of whilst Figure 2 represents a iurnace placed-horizontally. In many cases it may be preferable to alter this inclination oi the iurnaceinthe manner known accordins to the class of raw material being ample, by com be reduced with difliculty reduction none very slowly, charged. 'Under certain the muiiies being fully for this clined that the material upwards. The heating to pass through the.

natural 'I 0 i5 I Figure 1 the ex-. condenser are burnt in the the retort. In inclination oi the rotary iurnace 80- treated as. for ex- 05 7 all materials thatcan only circumstances a horieiiected, in the construction shown in Figure 1, by v 10 and in Figure 2 by aburner 11 which projects right through the hollow shaft 3' of the reed worm 3.

1 there-- muflle by the For the escape 6! the gases of combustion exhaust-gas outlets 12 are provided in the con the worm 3 to an ante-chamber 20 may, for example, be as illustrated in Figure 1b and a valve is inserted at two points; for instance,

muflle will, on rotation of the latter, pass through the coil as far as the point 39. The valve at this point may then passage of gas is prevented on account of the fact that the valve the material having been discharged, the valve at the point 39 is ring 47 (Figure la) This construction possesses the residue is cooled oii very quickdy because, with theaid of the outlets 13, it is very rapidly conveyed to 'the outside. Owing to the quick discharge of the residue the zinc vapours of becoming condensed upon Figure 1 heating of the retort is carried out upon principle maybe achieved.

- In the constructional form according to Figure 2 the charge passes from the bunker 4 through which is in mounted that the charge passes to the discharge an annular space 23 between at the point 38 is closed. Thus,

ing the temperature of the metal to prevent precipitation of the metal in and rotates together with the furnace. The residue is conducted, in a manner similar to that described with reference to Figure 1, from an outlet 24 into an annular chamber 25. The cooled residue leaves the and through the pipe 12 to the outside. The residue and metal vapours both moving in the same direction as the axis of rotation of the furnace, are removed from the reduction zone separately surrounding the condenser. 1

What I claim and desire to secure by Letters Patent of the United States is:-

i 1. A process for the distillation of readily volatilizable metals such as zinc, cadmium and the like in a rotary furnace having at least one retort built into it, according to which discharge of the distillation residue is effected through at least one lateral connection from the said retort extending through the wall of the said furnace.

material to heat in said retort to vaporize the metal content, feeding the material longitudinally of the retort while rotating the same, maintainthe retort and of the material therein above the condensation point of said retort, discharging the vaporized metal from the retort in the direction of the axis of rotation thereof, and discharging the solid resiude of the process radially with respect to said axis and through a wall of the furnace. "4g

mmnarcn JOHANNSEN. 

